Construction of spinning jets



Oef. 27, 1936. C Q BUTLER ET AL '2,058,48y

CONSTRUCTION OF SPINNINGJTS Filed April l2, 1935 FIG.3.

.I INVENTOR. 30 y jf/"1.15y 0. Butler .Stephen M. Bear' BY WWW.

Patented Oct. 27, 1936 rosanna CONSTRUCTION OF SPINNING LIE'rs l Cyrus 0. Butler and Stephen M. Bear, Kingsport, Tenn., assignors, by mesne assignments, to Eastman Kodak Company, Jersey City, N. J., a corporation of New Jersey Y Application April 12, 19.35, Serial No.,16,048

3 Claims.

This invention relates to either dry spinning orY wet spinning of artificial fibers and relates particularly to jets for use in the manufacture of artificial silk thread. One object of our invention is to provide a spinning jet which is sufficiently strong to withstand pressure on the dope from which the artificial filaments are made. Another object of our invention is to provide a spinning jet construction which permitsthe use of thin relatively expensive metals if necessary for the manv ufacture of spinning jets, and which reinforces the thin metal to withstand the necessary pressures. Another object of our invention is to prow vide a spinning jet of. the type described in which a support is provided for a filter medium, this support offering a minimum .obstruction to the dope passing through the filter and other .objects will appear from the following specification, the novel features being pointed outin the claims at the end thereof.

In dry or wet spinning of artificial fibers, it is desirable to use a thin fiat surfaced metallic cup so that a series of parallel orifices may be pierced through the at cup face. It is customary to provide these orifices in a pattern and one of the best known patterns is in the form of. a circle so that a series of artificial filaments can pass from the jet in a predetermined pattern and so that the filaments may be suitably twisted to form yarn. Because of the extremely small size of the orifices, the best results can be obtained with thin metal cups, a limit to the thickness .of the cup being reached when the metal may become dis"k torted Or rbulged outwardly due to the pressure applied t5 the dope in order to force it through the minute orifices. For best results, the very small orifices must be in parallel relation.

It is often necessary or desirable to filter the dope immediately before it passes into the spinning jet in order to remove any traces of foreign matter or slugs which might prevent the dope from passing freely through all of the orifices. Such a filter should have as much area exposed to the dope as possible, but since the filters may be of extremely fine wire mesh screen, or of .other suitable material which is not particularly strong,

. it is difficult to prevent a pressure on the dope Coming now to the drawing, wherein like referenoe characters denote like parts throughout.

Fig. 1 is a plan view of a spinning jet con- `the bottom wall 6.

Y (c1. 184s) structed in accordance with and'embodying vaY preferred form of our invention. c

Fig. 2 is a section through a spinning jet similar to that shown in Fig. 1, but'with the spinning jet supported onlthe end of a: dope supply line and with a filter inoperative position. l 'n Fig. 3 is applan view of a spinning jet''constructed in accordance with a second embodiment of our invention. l Y y Y Figure 4 is a section on line 4-4 of Fig. 3. Fig. 5 is a section similar to Fig. 4, but ofa third embodiment of our invention. Y g We prefer to provide a spinning jet in the shape of a cup designated broadly as I having a sub-V stanaauy nat bottom waII 2, and opstanding side wall 3 and anv outwardly flared ange 4 extending around the top of the cup. The cup is provided with a series of fine perforations 5 in a prede--V termined pattern here shown as being in the form of a circle. This leaves the center portion 6 of the cup unperforated. Y Y Y We prefer to reinforce the flat unperforated bottom 6 by means of Va block lfwhich in accordance with Figures 1 and 2 maybe welded to block may be provided Witha series of points or projections 9 which lie substantially flush with the top edge of the cup flange 4. Thus, when a filter I0 is placed on the flange 4 it may rest on the protuberances 9 and it may also be supported over the area of the flange 4 by means of the threaded ring I I and the threaded flange -I2 carried by the dope supply line I3.

From Fig. 2 it will be noted that the block'l fills a substantial portion of the cup and also that the grooves I4 in the block I permit dope to be forced through practically the entire area of the filter I0. Since the dope may pass through the filter into the grooves I4 and then throughA the grooves I4 and into the cup, the block 'l not only reinforces the bottom of the cup I, but in addition, it forms a support for the filter I0 and permits practically all of the filter to filter dope passing from thesupply I3'into the spinning jet to be forced through the apertures 5.

In accordance with Figs. 3 and 4, a block'I'l maybe provided with a series of projections I8 extending upwardly from a top I9 on the block which will be spaced from a filter supported by the projections I8V and the cup fiange 4. The block I'I may be attached to the cuppby means of rivets 20 and if desired the bottom of the block I'l may be provided with a curved wall 2| so that the dope Will be directed smoothly from the outerV Y Thek upper edge 8 of this u wall of the block and the inner walls 3 of the cup to the apertures 5.

While we have found that a solid block, as shown and described in the preceding figures, is entirely satisfactory, and is particularly suitable for reinforcing the spinning jet and supporting the filter, in some cases, such as where a large spinning jet is used, it is sometimes necessary or desirable to provide a reinforcing member inthe form of a block which is somewhat lighter in weight than the rst described embodiments lof-- Consequently, a cup, such -A as our invention. shown in Fig. 5, may be employed.' In this feature, the block 2l' is provided with a series of projections 28 between which there are grooves 29 as in the above described embodimentsof our invention. However, the block 2l is lightened by making it hollow as indicated at ,33, cutting away a large part of the material of which the block may be made. The downwardly extendingl annular flange 3lY surrounding the hollow portion may carry a series of tappediholes 32 into which the screws 33 may pass, these screws passing through counter sunk holes in the bottom wall S of the spinning jet. VThe block Vrnaythusbe held in place rigidly so as to reinforce or support the bottom wall 6 and prevent it from bulging outwardly` when pressure is applied to dope passing through the jet. The function of the projections 28 are exactly the same as the functions of the projections I8 and 8 on the blocks l'i and 'i as described above.

It is possible to make still other embodiments of our invention and we contemplate as within the scope of our invention all such forms as may come within the terms of the appended claims.

Having thus described our invention, what we declare is new and desire to secure by Letters Patent of the United States is:

1. A spinning jet for producing artiiicial fibers and adapted to be used with a filter comprising a cup of thin metal having a plurality of apertures therein arranged in a pattern and including an outwardly extending flange at the top of the cup, the center of the cup being unperforated, a block attached to the center unperforated portion of the cup and extending upwardly therein terminating in a top portion in substantial alignment with the flange of the cup, the top of said block including a plurality of projections with grooves in between the projections, the grooves lying beneath the surface' of the cup ange, the projections lying substantially in the plane of the cup flange and being adapted to form with the flange a filter support. l

2. A spinning jet for producing artificial fibers comprising a cup of thin metal having a plurality of apertures therein arranged in a pattern and including 'an outwardly extending flange at Vthe top of the cup, the center of the cup being unperforated, a block attached to the center unperforated portion of the cup and extending upwardly therein terminating in a top portion in substantial alignment with the iiange of the cup, the top of said block including a plurality of projections with grooves in between the projections, the grooves lying beneath the surface of the cup ange, and a filter resting on the cup flange and on the projections from the top of the block.

3. A spinning jet for forming artificial iilaments comprising a cup of thin metal of annular shape having a plurality of apertures in a flat bottom wallthereoi arranged in a circle, a blockV attached to the unperforated portion of the bottoni wall of the cup and being annular in shape, said block substantially filling a material portion of the cup and leaving an annular opening between` the outer wall of the block and the inner wall of the cup to which dope may be forced downwardly through the perforations in the bottom of the cup, the top oi said cup including a plurality of projections and a pluralitylof grooves, and a filter supported by the flange of the cup and the projections of the block whereby dope may be forced downwardly through the greater part of the filter and through the annular Space between the block and cup and outwardly through the perforations in the bottom thereof.

CYRUS BUTLER.

STEPHEN M. BEAR. 

